Sometimes smartphones are designed with a single-minded focus on one particular component, be it the SoC, screen, the underlying software, the camera, or as Changhong Z9 demonstrates, the battery. This 5.5-incher tucks in a 5,000 mAh juice bottle, which should last a while, on a full-charge.

　　Typical 5-inch to 5.5-inch devices ship with 2,500 to 3,000 mAh batteries, and 5.8-inch to 6.3-inchers hover around the 3,000 mAh mark. Some devices, like the Lenovo P780 and Oppo Find 7, take it a notch higher, at 4,000 mAh. The Changhong Z9 throws aesthetics out of the window, to cram in a 5,000 mAh battery rivaled only by 8-inch to 10-inch tablets.

　　Its feature-set is otherwise mid-thru-high at best. The 5.5-inch display offers HD (1280 x 720 pixels) resolution, a combination of 8-megapixel and 1.3-megapixel cameras, a trusty MediaTek MT6589 quad-core ARM Cortex-A7 SoC clocked at 1.20 GHz, 1 GB of RAM, unknown expandable storage, and Android 4.2 "Jelly Bean."